Musk has better protection than money. SpaceX is turning into the principal strategic asset in the hands of the US. The US government recognizes that, and they have been trying to help along potential competitors, so they are not so dependent on him. To no result so far.
So Musks greatest friend at this point is the DOD. Musk himself is the heart and soul of SpaceX and he can’t be replaced by some random manager. He is that proverbial goose.
That’s all very logical and true, but how often have we seen governments everywhere act illogically and completely dumb, IMO it’s out of the question that at some point Musk is to much trouble to tolerate regardless of SpaceX.